The standard is between 2 and 4 capsules a day. You can simply take them all at once or one at a time throughout the day. You do not necessarily need to take it with food. As with the addition of any concentrated supplement, it would be best to introduce this into your diet gradually to allow your body to adapt to it.
You can even break the vegetable capsule and pour the powder into your water, giving a quick stir. While waiting 10 minutes before drinking, you are delivering a potent antioxidant directly into the body which neutralize dangerous toxins simply by giving an extra electron.